Lyle, others ... I'm a career two-way radio tech. I've been in the midst of amateur radio VHF/UHF FM since (almost) the beginning. The first 2M repeater in Florida was built in my shop. I've been Montana's frequency coordinator for 30+ years. In short, I think I'm qualified to enter into the FM deviation discussion.
The industry's deviation standard is 4.5 kHz for today's 15 kHz channel spaced radios. Yes, there is a move to 12.5 kHz channel spacing in some services, but these (mostly) use "digital" techniques, and I don't for see this impacting any K3 users. Please consider this (+/- 4.5 kHz deviation) standard for the K3's FM mode. FWIW, when measured on Motorola's latest / greatest service monitor, my K3's (S/N 56 with a KFL3B FM filter and Ver. 2.80) transmitter deviates +/- 5.0 kHz on 52.525 with a menu setting of 4.0 kHz deviation. This is while using a "robust", sustained "F-o-u-r". (:-)) I didn't measure it on 10M FM. I won't enter into any discussion about ESSB, except to say most view a (transmitted) AM or SSB bandwith signal over 4.0 kHz wide to be excessive, discourteous and "not in good amateur practice". 73! Ken Kopp - K0PP _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
